Prospects of measuring oscillated decay-at-rest neutrinos at long baselines

Journal Article · 24 February 2020 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.101.033008 · OSTI ID:1601698

Harnik, Roni  ^[1]; Kelly, Kevin James  ^[1]; Machado, Pedro A.N.  ^[1]

---

1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

In addition to the next generation of beam-based neutrino experiments and their associated detectors, a number of intense, low-energy neutrino production sources from decays at rest will be in operation. In this work, we explore the physics opportunities with decay-at-rest neutrinos for complementary measurements of oscillation parameters at long baselines. The J-PARC Spallation Neutron Source, for example, will generate neutrinos from a variety of decay-at-rest (DAR) processes, specifically those of pions, muons, and kaons. Other proposed sources will produce large numbers of stopped pions and muons. We demonstrate the ability of the upcoming Hyper-Kamiokande experiment to detect the monochromatic kaon decay-at-rest neutrinos from J-PARC after they have travelled several hundred kilometers and undergone oscillations. This measurement will serve as a valuable cross-check in constraining our understanding of neutrino oscillations in a new regime of neutrino energy and baseline length. We also study the expected event rates from pion and muon DAR neutrinos in liquid Argon and water detectors and their sensitivities to to the CP violating phase $$\delta_\mathrm{CP}$$.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1601698
• Alternate ID(s): OSTI ID: 1574831
• Report Number(s): FERMILAB-PUB-19-541-T; PRVDAQ; oai:inspirehep.net:1764694; TRN: US2100139
• Journal Information: Physical Review D, Vol. 101, Issue 3; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English